The footage of the planned Jay-Z hanging (below) shows the extent to which these two NYC rap titans didn't get along. The Jigga likeness Nas commissioned was eerily lifelike, and beneath the rubber exterior, a series of pistons and other contraptions insured the dummy would writhe and squirm while hanging from the 19-foot gallows.

Luckily, Summer Jam organizers caught wind of Nas' plot and prohibited him from using the prop. That led the Queensbridge MC to pull out of the show altogether -- a move Minaj repeated this year, after a DJ dissed her track "Starships" during a pre-show concert.